* {
    padding: 0;
    margin: 0;
}

.box1 {
    height: 50px;
    background-color: skyblue;
    margin-bottom: 10px;
}

.box2 {
    width: 990px;
    height: 100px;
    background-color: skyblue;
    margin: 0 auto;
    margin-bottom: 10px;
}

.box3 {
    width: 990px;
    height: 80px;
    /* background-color: skyblue; */
    margin: 0 auto;
    margin-bottom: 10px;
}

li {
    list-style-type: none;
}

.box3 li {
    float: left;
    width: 240px;
    height: 80px;
    background-color: skyblue;
    margin-right: 10px;

}

.box3 .last3 {
    margin-right: 0;
}

.box4 {
    width: 990px;
    height: 150px;
    margin: 0 auto;
    margin-bottom: 10px;
    /* background-color: skyblue; */
}

.box4 li {
    float: left;
    width: 240px;
    height: 150px;
    background-color: skyblue;
    margin-right: 10px;
    margin-bottom: 10px;
}

.box4 .last4 {

    margin-right: 0;
}

.box5 {
    height: 100px;
    background-color: skyblue;
}